support class native clause

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 24 matching lines @@
     defineReflectiveTests(StatementParserTest);
     defineReflectiveTests(TopLevelParserTest);
   });
 }
 
 /**
  * Abstract base class for parser tests, which does not make assumptions about
  * which parser is used.
  */
 abstract class AbstractParserTestCase implements ParserTestHelpers {
+  bool get allowNativeClause;
+
   void set enableAssertInitializer(bool value);
 
   void set enableGenericMethodComments(bool value);
 
   void set enableLazyAssignmentOperators(bool value);
 
   void set enableNnbd(bool value);
 
   /**
    * Set a flag indicating whether the parser is to parse part-of directives
@@ skipping 8222 matching lines @@
  * analyzer parser.
  */
 class ParserTestCase extends EngineTestCase
     with ParserTestHelpers
     implements AbstractParserTestCase {
   /**
    * A flag indicating whether parser is to parse function bodies.
    */
   static bool parseFunctionBodies = true;
 
+  @override
+  bool allowNativeClause = true;
+
   /**
    * A flag indicating whether the parser is to parse asserts in the initializer
    * list of a constructor.
    */
   bool enableAssertInitializer = false;
 
   /**
    * A flag indicating whether parser is to parse async.
    */
   bool parseAsync = true;
@@ skipping 5505 matching lines @@
       expect(annotation.constructorName.name, 'bar');
       expect(annotation.arguments, isNotNull);
       expect(annotation.arguments.arguments, hasLength(2));
     }
   }
 
   void test_parseClassDeclaration_native() {
     createParser('class A native "nativeValue" {}');
     CompilationUnitMember member = parseFullCompilationUnitMember();
     expect(member, isNotNull);
-    assertNoErrors();
+    if (!allowNativeClause) {
+      assertErrorsWithCodes([
+        ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
+      ]);
+    } else {
+      assertNoErrors();
+    }
     expect(member, new isInstanceOf<ClassDeclaration>());
     ClassDeclaration declaration = member;
     NativeClause nativeClause = declaration.nativeClause;
     expect(nativeClause, isNotNull);
     expect(nativeClause.nativeKeyword, isNotNull);
     expect(nativeClause.name.stringValue, "nativeValue");
     expect(nativeClause.beginToken, same(nativeClause.nativeKeyword));
     expect(nativeClause.endToken, same(nativeClause.name.endToken));
   }
 
@@ skipping 1610 matching lines @@
     expectCommentText(typeVariable.documentationComment, '/// Doc');
   }
 
   /**
    * Assert that the given [name] is in declaration context.
    */
   void _assertIsDeclarationName(SimpleIdentifier name) {
     expect(name.inDeclarationContext(), isTrue);
   }
 }